Call bash function using vim external command

Question

I use vim\'s :! external command function all the time, usually providing % as an argument to the shell command. For example :

:!psql -f %

Answer 1

The accepted answer didn't work for me. I'm going to go with setting shcf, as suggested elsewhere:

:set shcf=-ic

but another solutions is

!source ~/.bashrc && psql ...

Unfortunately, no solution allows the auto-completion for the command I'm creating to work properly. (The auto_completions suggested are for names of files in my current directory, rather than the ones I specified as follows in .bashrc

complete -F _generate_foo_completions foo